/* BEGIN_HEADER */
#include "lmots.h"
#include "mbedtls/lms.h"

#if defined(MBEDTLS_TEST_HOOKS)
int check_lmots_private_key_for_leak(unsigned char * sig)
{
    size_t idx;

    for( idx = MBEDTLS_LMOTS_SIG_SIGNATURE_OFFSET(MBEDTLS_LMOTS_SHA256_N32_W8);
         idx < MBEDTLS_LMOTS_SIG_LEN(MBEDTLS_LMOTS_SHA256_N32_W8);
         idx++ )
    {
        if( sig[idx] != 0x7E ) {
            return 1;
        }
    }

    return 0;
}
#endif /* defined(MBEDTLS_TEST_HOOKS) */

/* END_HEADER */

/* BEGIN_DEPENDENCIES
 * depends_on:MBEDTLS_LMS_C
 * END_DEPENDENCIES
 */

/* BEGIN_CASE depends_on:MBEDTLS_LMS_PRIVATE */
void lmots_sign_verify_test ( data_t *msg, data_t *key_id, int leaf_id,
                              data_t *seed )
{
    mbedtls_lmots_public_t pub_ctx;
    mbedtls_lmots_private_t priv_ctx;
    unsigned char sig[MBEDTLS_LMOTS_SIG_LEN(MBEDTLS_LMOTS_SHA256_N32_W8)];

    mbedtls_lmots_public_init( &pub_ctx );
    mbedtls_lmots_private_init( &priv_ctx );

    TEST_EQUAL( mbedtls_lmots_generate_private_key(&priv_ctx, MBEDTLS_LMOTS_SHA256_N32_W8,
                key_id->x, leaf_id, seed->x, seed->len ), 0 );
    TEST_EQUAL( mbedtls_lmots_calculate_public_key(&pub_ctx, &priv_ctx), 0 );
    TEST_EQUAL( mbedtls_lmots_sign(&priv_ctx, &mbedtls_test_rnd_std_rand, NULL,
                msg->x, msg->len, sig, sizeof(sig), NULL ), 0 );
    TEST_EQUAL( mbedtls_lmots_verify(&pub_ctx, msg->x, msg->len, sig, sizeof(sig)), 0 );

exit:
    mbedtls_lmots_public_free( &pub_ctx );
    mbedtls_lmots_private_free( &priv_ctx );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_LMS_PRIVATE */
void lmots_sign_verify_null_msg_test ( data_t *key_id, int leaf_id, data_t *seed )
{
    mbedtls_lmots_public_t pub_ctx;
    mbedtls_lmots_private_t priv_ctx;
    unsigned char sig[MBEDTLS_LMOTS_SIG_LEN(MBEDTLS_LMOTS_SHA256_N32_W8)];

    mbedtls_lmots_public_init( &pub_ctx );
    mbedtls_lmots_private_init( &priv_ctx );

    TEST_EQUAL( mbedtls_lmots_generate_private_key(&priv_ctx, MBEDTLS_LMOTS_SHA256_N32_W8,
                key_id->x, leaf_id, seed->x, seed->len ), 0 );
    TEST_EQUAL( mbedtls_lmots_calculate_public_key(&pub_ctx, &priv_ctx), 0 );
    TEST_EQUAL( mbedtls_lmots_sign(&priv_ctx, &mbedtls_test_rnd_std_rand, NULL,
                NULL, 0, sig, sizeof(sig), NULL ), 0 );
    TEST_EQUAL( mbedtls_lmots_verify(&pub_ctx, NULL, 0, sig, sizeof(sig)), 0 );

exit:
    mbedtls_lmots_public_free( &pub_ctx );
    mbedtls_lmots_private_free( &priv_ctx );
}
/* END_CASE */

/* BEGIN_CASE */
void lmots_verify_test ( data_t *msg, data_t *sig, data_t *pub_key,
                          int expected_rc )
{
    mbedtls_lmots_public_t ctx;
    unsigned int size;
    unsigned char *tmp_sig = NULL;

    mbedtls_lmots_public_init( &ctx );

    TEST_EQUAL(mbedtls_lmots_import_public_key( &ctx, pub_key->x, pub_key->len ), 0);

    TEST_EQUAL(mbedtls_lmots_verify( &ctx, msg->x, msg->len, sig->x, sig->len ), expected_rc);

    /* Test negative cases if the input data is valid */
    if( expected_rc == 0 )
    {
        /* Altering first message byte must cause verification failure */
        msg->x[0] ^= 1;
        TEST_EQUAL(mbedtls_lmots_verify( &ctx, msg->x, msg->len, sig->x, sig->len ),
                   MBEDTLS_ERR_LMS_VERIFY_FAILED);
        msg->x[0] ^= 1;

        /* Altering last message byte must cause verification failure */
        msg->x[msg->len - 1] ^= 1;
        TEST_EQUAL(mbedtls_lmots_verify( &ctx, msg->x, msg->len, sig->x, sig->len ),
                   MBEDTLS_ERR_LMS_VERIFY_FAILED);
        msg->x[msg->len - 1] ^= 1;

        /* Altering first signature byte must cause verification failure */
        sig->x[0] ^= 1;
        TEST_EQUAL(mbedtls_lmots_verify( &ctx, msg->x, msg->len, sig->x, sig->len ),
                   MBEDTLS_ERR_LMS_VERIFY_FAILED);
        sig->x[0] ^= 1;

        /* Altering first signature byte must cause verification failure */
        sig->x[0] ^= 1;
        TEST_EQUAL(mbedtls_lmots_verify( &ctx, msg->x, msg->len, sig->x, sig->len ),
                   MBEDTLS_ERR_LMS_VERIFY_FAILED);
        sig->x[0] ^= 1;

        /* Altering last signature byte must cause verification failure */
        sig->x[sig->len - 1] ^= 1;
        TEST_EQUAL(mbedtls_lmots_verify( &ctx, msg->x, msg->len, sig->x, sig->len ),
                   MBEDTLS_ERR_LMS_VERIFY_FAILED);
        sig->x[sig->len - 1] ^= 1;

        /* Signatures of all sizes must not verify, whether shorter or longer */
        for( size = 0; size < sig->len; size++ ) {
            if( size == sig->len )
                continue;

            ASSERT_ALLOC( tmp_sig, size );
            if( tmp_sig != NULL )
                memcpy( tmp_sig, sig->x, MIN(size, sig->len) );

            TEST_EQUAL(mbedtls_lmots_verify( &ctx, msg->x, msg->len, tmp_sig, size ),
                       MBEDTLS_ERR_LMS_VERIFY_FAILED);
            mbedtls_free( tmp_sig );
            tmp_sig = NULL;
        }
    }

exit:
    mbedtls_lmots_public_free( &ctx );
}
/* END_CASE */

/* BEGIN_CASE */
void lmots_import_export_test (  data_t * pub_key )
{
    mbedtls_lmots_public_t ctx;
    uint8_t exported_pub_key[MBEDTLS_LMOTS_PUBLIC_KEY_LEN(MBEDTLS_LMOTS_SHA256_N32_W8)];
    size_t exported_pub_key_len;

    mbedtls_lmots_public_init( &ctx );
    TEST_EQUAL( mbedtls_lmots_import_public_key( &ctx, pub_key->x, pub_key->len ), 0 );
    TEST_EQUAL( mbedtls_lmots_export_public_key( &ctx, exported_pub_key,
                                                 sizeof( exported_pub_key ),
                                                 &exported_pub_key_len ), 0 );

    ASSERT_COMPARE( pub_key->x, pub_key->len,
                    exported_pub_key, exported_pub_key_len );

exit:
    mbedtls_lmots_public_free( &ctx );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_LMS_PRIVATE */
void lmots_reuse_test ( data_t *msg, data_t *key_id, int leaf_id, data_t *seed )
{
    mbedtls_lmots_private_t ctx;
    unsigned char sig[MBEDTLS_LMOTS_SIG_LEN(MBEDTLS_LMOTS_SHA256_N32_W8)];

    mbedtls_lmots_private_init( &ctx );
    TEST_EQUAL( mbedtls_lmots_generate_private_key(&ctx, MBEDTLS_LMOTS_SHA256_N32_W8,
                                                   key_id->x, leaf_id, seed->x,
                                                   seed->len ), 0 );
    TEST_EQUAL( mbedtls_lmots_sign(&ctx, mbedtls_test_rnd_std_rand, NULL,
                                   msg->x, msg->len, sig, sizeof( sig ), NULL ), 0 );

    /* Running another sign operation should fail, since the key should now have
     * been erased.
     */
    TEST_EQUAL( mbedtls_lmots_sign(&ctx, mbedtls_test_rnd_std_rand, NULL,
                                   msg->x, msg->len, sig, sizeof( sig ), NULL ), MBEDTLS_ERR_LMS_BAD_INPUT_DATA );

exit:
    mbedtls_lmots_private_free( &ctx );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_TEST_HOOKS */
void lmots_signature_leak_test ( data_t *msg, data_t *key_id, int leaf_id,
                                 data_t *seed )
{
    mbedtls_lmots_private_t ctx;
    unsigned char sig[MBEDTLS_LMOTS_SIG_LEN(MBEDTLS_LMOTS_SHA256_N32_W8)];

    mbedtls_lmots_sign_private_key_invalidated_hook = &check_lmots_private_key_for_leak;

    /* Fill with recognisable pattern */
    memset( sig, 0x7E, sizeof( sig ) );

    mbedtls_lmots_private_init( &ctx );
    TEST_EQUAL( mbedtls_lmots_generate_private_key(&ctx, MBEDTLS_LMOTS_SHA256_N32_W8,
                                                   key_id->x, leaf_id, seed->x,
                                                   seed->len ), 0 );
    TEST_EQUAL( mbedtls_lmots_sign(&ctx, mbedtls_test_rnd_std_rand, NULL,
                                   msg->x, msg->len, sig, sizeof( sig ), NULL ), 0 );

exit:
    mbedtls_lmots_private_free( &ctx );
    mbedtls_lmots_sign_private_key_invalidated_hook = NULL;
}
/* END_CASE */